Green preparation method of light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic

A porous ceramic, low thermal conductivity technology, applied in ceramic products, applications, household appliances, etc., can solve problems such as unfavorable green industrial production, little research on porous ceramics, etc., to achieve easy mass production, fewer types of raw materials, and preparation methods simple effect

Active Publication Date: 2015-03-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, corresponding other raw materials (such as: crosslinking agent N,N'-methylenebisacrylamide, catalyst N,N,N',N'-tetramethylethylenediamine and initiator ammonium persulfate, etc.) It is a toxic or pungent substance, which is not conducive to green industrial production (M.A.Janney, e

Method used

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  • Green preparation method of light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic
  • Green preparation method of light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic
  • Green preparation method of light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] First weigh 50g deionized water, add 1g citric acid and Y under constant stirring 2 O 3 :SiO 2 100g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 1-2μm, and then stirred for 3 hours to form a slurry;

[0027] Then put the slurry in a water bath at 45°C, add 1.5g of sodium lauryl sulfate, stir quickly (the mixer speed is 1700rpm) for foaming for 20 minutes, then add 3.5g of gelatin and 3g of glycerol, and stir for 5 minutes Post-injection molding, forming a blank after demolding;

[0028] The green body was dried at room temperature for 20 hours, and then dried in an oven at 75°C for 25 hours. Finally, high-temperature reaction sintering was carried out at 1525°C in air. The heating rate of high-temperature reaction sintering was 5°C / min, and the holding time was 1.5 hours. Burn off organic compounds and synthesize γ-Y with light weight, high porosity and low thermal conductivity through a green ...

Example Embodiment

[0029] Example 2

[0030] Weigh 40g deionized water first, add 0.5g ammonium citrate and Y under constant stirring 2 O 3 : SiO 2 80g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 2 ~ 3μm, and then stirred for 1.5 hours to form a slurry;

[0031] Then put the slurry in a water bath at 40°C, add 0.6g of sodium lauryl sulfate, stir quickly (the mixer speed is 1500rpm) for foaming for 10 minutes, then add 2.5g of gelatin and 2g of polyethylene glycol, and stir for 10 minutes. Injection moulding in minutes, forming a green body after demoulding;

[0032] The green body was dried at room temperature for 30 hours, and then dried in an oven at 65°C for 30 hours. Finally, high-temperature reaction sintering was carried out at 1500°C in the air. The heating rate of high-temperature reaction sintering was 7°C / min, and the holding time was 2 hours. Burn off organic compounds and prepare γ-Y with light weight, high porosity and low t...

Example Embodiment

[0033] Example 3

[0034] Weigh 60g deionized water first, add 1.5g ammonium citrate and Y under constant stirring 2 O 3 : SiO 2 120g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 0.5 ~ 1.5μm, and then stirred for 2 hours to form a slurry;

[0035] Then put the slurry in a 48°C water bath, add 2g of sodium lauryl sulfonate, stir quickly (the mixer speed is 2000rpm) for foaming for 25 minutes, then add 4g of gelatin and 5g of polyethylene glycol, and stir for 15 minutes Post-injection molding, forming a green body after demolding;

[0036] The green body was dried at room temperature for 25 hours, and then dried in an oven at 85°C for 20 hours. Finally, high-temperature reaction sintering was carried out at 1550°C in air. The heating rate of high-temperature reaction sintering was 2°C / min, and the holding time was 1 hour. Burn off organic compounds and prepare γ-Y with light weight, high porosity and low thermal conductiv...

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Abstract

The invention relates to the field of porous ceramic heat-insulating materials, particularly a method for preparing light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic by a green and environment-friendly foaming-gelcasting process. The method comprises the following steps: by using yttrium oxide and silicon oxide powders as raw materials, citric acid or ammonium citrate as a dispersing agent and technical gelatine as a gelatinizer, stirring the slurry for 1-3 hours, heating to 40-50 DEG C, adding a foaming agent lauryl sodium sulfate or sodium dodecylsulfate, the gelatinizer gelatine and glycerol or polyethyleneglycol for preventing the billet from cracking, and carrying out mold injection; and after demolding, drying at room temperature for 20-30 hours, drying at 65-85 DEG C for 20-30 hours, and finally, carrying out high-temperature reaction sintering at 1500-1550 DEG C for 1-2 hours to obtain the gamma-Y2Si2O7 porous ceramic. The method is green and environment-friendly, does not use any toxic or harmful raw material, is simple, and is low in cost and very suitable for industrial production.

Description

technical field [0001] The invention relates to the field of porous ceramic thermal insulation materials, in particular to a γ-Y material with light weight, high porosity and low thermal conductivity prepared by a green and environmentally friendly foaming and coagulation process. 2 Si 2 o 7 Methods for Porous Ceramic Materials. Background technique [0002] γ-Y 2 Si 2 o 7 Ceramics have broad potential application prospects in high-temperature structural materials, ring barrier coatings of silicon-based ceramics, and thermal insulation materials. Furthermore, γ-Y 2 Si 2 o 7 Due to its excellent chemical and thermal stability (stable from room temperature to 1500°C), and low thermal conductivity (<2W / (m K), >1000°C) (Z.Q.Sun, et al.J .Am.Ceram.Soc.(Journal of American Ceramic Society).2008(91)[8]:2623-2629.), after the ceramics are prepared into porous ceramics, γ-Y 2 Si 2 o 7 Porous ceramics not only have lower density and good stability, but also their the...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/16C04B35/505
Inventor 王京阳吴贞孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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